On Tuesday 04 November 2008, [EMAIL PROTECTED] wrote:
>I have to cut very fine threads on aluminum, basically Pentax M42
>threads would be the finest thread.
>Anyone has an idea for the right insert for this for both inside and
>outside threads.
>I preferably want to use one tool holder and change inserts.
>
>Thanks.
>
I have diligently searched for, but not found, any carbide inserts with the
correct profiles for thread cutting, so I've had to custom grind my own from
tools and boring bars with brazed inserts. The problem is the included
angle, its 15 degrees sharper than the available inserts. MSC however does
have a good selection of single toothed solid carbide boring bars. Whether
those would have a sharp enough tip for that fine a tpi thread I don't know.
Those fine, narrow angle tips are VERY easily chipped. HS steel might be a
better choice if its swimming in cutting lube to keep the air away from the
alu, which if allowed will dull the bits 50x faster due to the instant
formation of the oxide film on the alu.
If there are such inserts available, can someone please post a link?
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
When you go into court you are putting your fate into the hands of twelve
people who weren't smart enough to get out of jury duty.
-- Norm Crosby
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